CalcLockPick the format for the next step
PNG is useful for screenshots, crisp text and transparency. JPEG is widely accepted for photographs and uses lossy compression at a fixed 90% quality setting here. WebP can preserve transparency with smaller files, but the service receiving your file must accept it.
Choose a background before making JPEG
JPEG has no transparency. Choose a solid background color to fill transparent pixels rather than leaving the browser to decide. PNG and WebP retain canvas transparency. Changing an extension alone does not convert a file; this tool actually re-encodes its pixels.
Browser support is checked at export
If your browser cannot encode WebP, the tool reports that limitation and does not offer a mislabeled PNG download. Choose PNG or JPEG instead. HEIC, AVIF, GIF and SVG inputs are outside this tool’s supported formats. Animation, layers and original color-profile behavior are not preserved.
Local processing, with clear limits
These are standalone website utilities, separate from the CalcLock iPhone vault. Selecting a photo does not import it into the app. The tool’s code processes selected images in your browser and does not upload them, use a remote image service or save them to browser storage. Downloaded files go wherever your browser normally saves downloads.
Re-encoding creates a new pixel-based copy without copying the original EXIF metadata. This applies only to the generated copy, not your original, backups or other shared copies. It is not a promise that every identifying detail has been removed: visible content can identify you, and browsers may add encoding information. Color rendering and orientation may differ between applications; inspect your output.
Inputs are limited to 25 MB, 24 million pixels and 10,000 pixels on either side. Some devices may run out of memory below these limits. Only browser-decodable PNG, JPEG and WebP files are accepted. Animated images are flattened to a browser-decoded frame; do not use this tool to preserve animation. Clear releases the tool’s image references and download URLs; it does not securely erase device memory or remove downloaded files.
More photo utilities
All planning and photo tools · Understand the vault’s privacy boundaries